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Illustration of the dimension measurement approaches using dense point clouds. Subfigures (b,d,f) are the 3D images of O1_1, O2_1 and O3_1, respectively. Subfigures (a,c,e) are the projected images in x-y plane and (g) shows the way to select dimension points and remove extreme points and noises. The x, y and z dimensional units used in (a–f) are mm.
